the city's main square was surrounded by barricades. the chant was revolution. the president's office was ringing with riot police. tonight, from inside those defenses, he gave a lengthy interview in which he appealed for calm. >> members of the government and the security services and the people on the rallies must all , he toldhe law interviewers from four different tv channels. >> but his rivals called on him to step down. foreign language] >> there is still an arab determination from the protesters thomas who say they won't go away until the president resigns -- from the protesters, who say they won't go away until the president resigns. >> we want to see a new leader and government here in the ukraine. >> i think most people will stay here. all of the ukraine is coming here. >> people are coming every day. >> it is just the beginning. >> the trigger for these protests was the president's decision to postpone ukraine's move toward the european union and away from russia. for many, especially in the western half of this divided country, that was a reason to t